Course correction unit

Abstract

This invention relates to a course correction unit, specifically but not exclusively for use on a spin stabilized guided projectile which can produce high speed instantaneous course correction.

I claim: 
     
       1. A course correction unit comprising: a chamber to be filled with propellant in use;   a valve member of non-uniform cross-section; and   releasable securing means, comprising a frangible link, for holding said valve member closed, characterised in that said securing means is configured to release the valve member at a predetermined pressure.   
     
     
       2. A course correction unit according to claim 1, wherein said valve member is tapered. 
     
     
       3. A course correction unit according to claim 1, wherein said valve member has shoulders. 
     
     
       4. A course correction unit according to any one of the preceding claims, wherein said securing means releases owing to a shearing force acting on the tapered sides of the valve. 
     
     
       5. A course correction unit according to any one of claim 1, wherein said securing means releases at a predetermined temperature. 
     
     
       6. A course correction unit according to any one of claims 1 to 3, wherein said chamber comprises a pressure sensor which is operable to cause release of the securing means at a predetermined pressure. 
     
     
       7. A course correction unit according to any one of claims 1 to 3, wherein said securing means comprises an explosive device which is operable to cause release of the securing means.